305/35R22 vs 275/25R24

275/25R24 is 0.99 in (25.2 mm) shorter than 305/35R22, a −3.26% diameter difference. With the speedometer set for 305/35R22, an indicated 60 mph is 58.0 mph on 275/25R24.

Is this a safe swap?

Diameter difference −3.26%: outside the ±3% guideline

By overall diameter alone, 275/25R24 falls outside the ±3% range commonly used as a guideline when replacing 305/35R22; speedometer and ride-height changes are larger. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

305/35R22 vs 275/25R24 differences
Measurement	305/35R22	275/25R24	Difference	% diff
Overall diameter	30.41 in (772.3 mm)	29.41 in (747.1 mm)	−0.99 in (−25.2 mm)	−3.26%
Sidewall height	4.20 in (106.8 mm)	2.71 in (68.8 mm)	−1.50 in (−38.0 mm)	−35.60%
Section width	12.01 in (305.0 mm)	10.83 in (275.0 mm)	−1.18 in (−30.0 mm)	−9.84%
Circumference	95.52 in (2,426.3 mm)	92.40 in (2,347.1 mm)	−3.12 in (−79.2 mm)	−3.26%
Revolutions per mile	663	686	+22	+3.37%

True speed with the speedometer calibrated for 305/35R22
Indicated	Actual on 305/35R22	Actual on 275/25R24	Difference
30 mph	30.0 mph	29.0 mph	−1.0 mph
60 mph	60.0 mph	58.0 mph	−2.0 mph
75 mph	75.0 mph	72.6 mph	−2.4 mph

Ride-height change: 275/25R24 lowers the vehicle by 0.50 in (12.6 mm) at the axle (half the −25.2 mm diameter difference).

275/25R24 is 0.99 in shorter than 305/35R22 and 30 mm narrower, a 3.26% difference in overall diameter.

With the speedometer calibrated for 305/35R22, an indicated 60 mph is actually 58.0 mph on 275/25R24, and revolutions per mile change from 663 to 686.

275/25R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 305/35R22.

Size pages

Other comparisons with 305/35R22

Other comparisons with 275/25R24

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.